Steady-state behaviour of PFR-separation-recycle systems with simultaneous exothermic and endothermic, first-order reactions

Klaas Steur, Costin S. Bildea, Pietro Altimari, Alexandre C. Dimian

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4 Citations (Scopus)


A systematic investigation of plug-flow reactor (PFR)-separation-recycle systems where first-order exothermic and endothermic reactions are simultaneously performed is presented. The nonlinear behaviour is analyzed for two flowsheet alternatives and four plantwide control structures. It is shown that the system can exhibit a complex nonlinear behaviour. For the parameter values used, regions of unfeasibility, two or three multiple steady states and branches of isolated solutions were found. The undesired nonlinear phenomena can be avoided by fixing the reactor-inlet flow rates of each reactant or, when this is impossible due to the flowsheet structure, by providing sufficient cooling capacity.

Original languageEnglish
Pages (from-to)628-635
Number of pages8
JournalComputers and Chemical Engineering
Issue number3
Publication statusPublished - Mar 20 2009



  • Nonlinear behaviour
  • PFR-separation-recycle systems
  • Simultaneous reactions

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Computer Science Applications

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